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Spring Framework example source code file (InternalResourceViewResolver.java)

This example Spring Framework source code file (InternalResourceViewResolver.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Spring Framework tags/keywords

abstracturlbasedview, boolean, boolean, class, class, exception, internalresourceview, internalresourceview, internalresourceviewresolver, internalresourceviewresolver, string, urlbasedviewresolver

The Spring Framework InternalResourceViewResolver.java source code

/*
 * Copyright 2002-2008 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.web.servlet.view;

import org.springframework.util.ClassUtils;

/**
 * Convenient subclass of {@link UrlBasedViewResolver} that supports
 * {@link InternalResourceView} (i.e. Servlets and JSPs) and subclasses
 * such as {@link JstlView} and
 * {@link org.springframework.web.servlet.view.tiles.TilesView}.
 *
 * <p>The view class for all views generated by this resolver can be specified
 * via {@link #setViewClass}. See {@link UrlBasedViewResolver}'s javadoc for details.
 * The default is {@link InternalResourceView}, or {@link JstlView} if the
 * JSTL API is present.
 *
 * <p>BTW, it's good practice to put JSP files that just serve as views under
 * WEB-INF, to hide them from direct access (e.g. via a manually entered URL).
 * Only controllers will be able to access them then.
 *
 * <p>Note: When chaining ViewResolvers, an InternalResourceViewResolver
 * always needs to be last, as it will attempt to resolve any view name,
 * no matter whether the underlying resource actually exists.
 *
 * @author Juergen Hoeller
 * @since 17.02.2003
 * @see #setViewClass
 * @see #setPrefix
 * @see #setSuffix
 * @see #setRequestContextAttribute
 * @see InternalResourceView
 * @see JstlView
 * @see org.springframework.web.servlet.view.tiles.TilesView
 */
public class InternalResourceViewResolver extends UrlBasedViewResolver {

	private static final boolean jstlPresent = ClassUtils.isPresent(
			"javax.servlet.jsp.jstl.core.Config", InternalResourceViewResolver.class.getClassLoader());

	private Boolean alwaysInclude;

	private Boolean exposeContextBeansAsAttributes;

	private String[] exposedContextBeanNames;


	/**
	 * Sets the default {@link #setViewClass view class} to {@link #requiredViewClass}:
	 * by default {@link InternalResourceView}, or {@link JstlView} if the JSTL API
	 * is present.
	 */
	public InternalResourceViewResolver() {
		Class viewClass = requiredViewClass();
		if (viewClass.equals(InternalResourceView.class) && jstlPresent) {
			viewClass = JstlView.class;
		}
		setViewClass(viewClass);
	}

	/**
	 * This resolver requires {@link InternalResourceView}.
	 */
	protected Class requiredViewClass() {
		return InternalResourceView.class;
	}


	/**
	 * Specify whether to always include the view rather than forward to it.
	 * <p>Default is "false". Switch this flag on to enforce the use of a
	 * Servlet include, even if a forward would be possible.
	 * @see InternalResourceView#setAlwaysInclude
	 */
	public void setAlwaysInclude(boolean alwaysInclude) {
		this.alwaysInclude = Boolean.valueOf(alwaysInclude);
	}

	/**
	 * Set whether to make all Spring beans in the application context accessible
	 * as request attributes, through lazy checking once an attribute gets accessed.
	 * <p>This will make all such beans accessible in plain ${...}
	 * expressions in a JSP 2.0 page, as well as in JSTL's <code>c:out
	 * value expressions.
	 * <p>Default is "false".
	 * @see InternalResourceView#setExposeContextBeansAsAttributes
	 */
	public void setExposeContextBeansAsAttributes(boolean exposeContextBeansAsAttributes) {
		this.exposeContextBeansAsAttributes = Boolean.valueOf(exposeContextBeansAsAttributes);
	}

	/**
	 * Specify the names of beans in the context which are supposed to be exposed.
	 * If this is non-null, only the specified beans are eligible for exposure as
	 * attributes.
	 * @see InternalResourceView#setExposedContextBeanNames
	 */
	public void setExposedContextBeanNames(String[] exposedContextBeanNames) {
		this.exposedContextBeanNames = exposedContextBeanNames;
	}


	protected AbstractUrlBasedView buildView(String viewName) throws Exception {
		InternalResourceView view = (InternalResourceView) super.buildView(viewName);
		if (this.alwaysInclude != null) {
			view.setAlwaysInclude(this.alwaysInclude.booleanValue());
		}
		if (this.exposeContextBeansAsAttributes != null) {
			view.setExposeContextBeansAsAttributes(this.exposeContextBeansAsAttributes.booleanValue());
		}
		if (this.exposedContextBeanNames != null) {
			view.setExposedContextBeanNames(this.exposedContextBeanNames);
		}
		view.setPreventDispatchLoop(true);
		return view;
	}

}

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